Party-line lock-out.



PATENTED FEB. 26, 1907 M. P. BOONE.

PARTY LINE LOCK-OUT.

APPLICATION TILED JAN.2'7,1906.

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i the time of establishment of the desired con- STATES PATENT OFFICE.

MARK P. BooN-E, oF-.PERU, INDIANA, ASSIGNOR TO THE PERU ooMMoN BATTERY LOCK-OUT TELEPHONE .coMPANY, or PERU, INDIANA,

A CORPORATION OF INDIANA.

PAR TY LlNE LOCK-OUT.

- Specification of Letters Patent.

Eatented Feb. 26, 1907- Application filed J'anu'ary 2'7, 1906. Serial No. 298.272.

Tort/,1 whom it mai'y concern:

Be it known that 1, MARK 330cm,- a

' citizen of the United States, residing at Peru,

In Batent' No-. 798,561, issued to meA'u gust 29, 1.905, means is shown for'preventing members of a party-line system of telephones from cutting into the line when it is in useby any member; but the arrangement is such that when intercommunication between two members, of a party line service is desired there may be considerablenoise iii-the receiving-circuit of the calling-phone'durixig nections. p

The object of my present 'inventlon' s to provide means by which the desired connection of parties may be obtained which shall. be more simple thanthat disclosedinmy prior patent and to'jalso provide means for permitting intercommu-nication oilsuch' (hire mannerr -j' acter asto befreevfrom noise of establishment of connections. A

The accompanying drawing illustrates diagrammatically a two-p arty lineequi pped with my im rovements k I In't edrawing, indicates the common batter at central, the positive-sidebeing groun ed'" at G. inthe usual: and welleknown T and S respectivel indicate the and sleeve sides, f the main line from exchange extending- 1 ht'ral -th party oup "of telephones, afiiijt'and s indicate,respectively,

' the tip 'andislejve side of'the -corresponding battery isficonnected to the v S throughsuitable inductonce or resists ce coils I and I respectively,

which should be equal for satisfactory service.

The .two telephones, X and Y are connected to the linewires T and S inthe usualway,

each station having,theusuallterminals'si, t-,[

and 9, terminal eing onnectedbyawire 11' with main wire'j-S;tern1inal tv be ing',: con nected by a wire 12 to the-main-linewi'r "T, and terminalig being connected hy w'ire 13 with a Gil In the diagram terminal t is connected toa'springterminal 1.5 i

{the traneniittetgltgand A.

theinduction-coil ofjthe receiver 17 in the usual manner, and this terminal is held northe, weight ofthe-receiver on the receiver hook 19'.= Terminal 18 connected toterminal s. by a circuit 20, which consists in A part "of-anormally closed switchj21, which al'everoe may be manually opened by means of 22. Bridging the switch 21 is a condenser 23;,the purpose of which will appear.

" Leading from the termmal s is a wire ground terminal g of the station. Arranged ad acent magnet 25 is a detent-arm 27,

'ing over the sleeve side, 0 the main line are -1ikely to cause a chattering of the detent-- arms 27, and in order to prevent this I pro- 'l'or normally holding the arm 27 in position .to prevent movement of terminal 15, the arrangement being such,however, that so soon asthe receiver 1s withdrawn from'thehook movement of the terminal 15 unless t e electromagnet 25 has been r'oprly energized. Forthis purpose I provi e t e hook 19 with an arm 19', adapted to enga 27,carrie d by the arm 27, t

the weiglitofthe receiver; arm19 willenga 'efshoulder 27 and .hold the arm 27 ;}up

Arm 19 is also provided with an a rm11-9', adapted to engage a shoulder 15" formed on "an extension of terminal 15, said shoulder be-- permitarm27 .to dro will retainjterminal 5juntil after'arm 27', as dropped out flmo'vemen't of theterminallfir mally out of contact witha terminal 18 by which is connected to one end of the coil of an electromagnet 25, the opposite end of said '-coil being connected by a wire 26 with the I whichf-when in its osition nearest the elec- -tromagnetlies in t e path of movement of '70 practical find that in a selective ringing 7 5 5 system thealternating rin ing-currents pass- 'vide means controlledby the receiver-hook l the arm 27 will drop away from the 'ath of 5 7 go a shoulder I p rearrangement 99 gbeing such; that when the-hooklQ- is 'in'the 1 position shown in, the drawing byreason of tig tly' against the pole of the magnet'25.19$

fin'g substantially concentric with the pivotf, of"hook,,19,1 so that the initial movement '0f-"- Ic 0 hook .19 in' an upwarddirectiomgwhich will As a convenient means for indicating when the line is busy I provide the terminal 15 with an extension which carries at its lower end a target l5 and provide an opening in the inclosing casing (not shown) which will dis close the target whenit has been moved to the left, so that if a subscriber takes down his receiver and the target 15 fails toappear he will know that the line is busy.

In operation under normal conditions there will be no potential in the circuit between the terminal 8 of any station and its ground g, If subscriber Y, however, takes down his receiver, the detent-arn'i 27 of his station will immediately .drop out of the path nets 25 to holdthe detent-arms'27 in position to preventmoveznent of the correspondmg terminals 15, sosithat if subscriber B.

should take *down his receiver the corre spending--detent-arm 27 would not be allowed to drop out of the path of movement of the corresponding terminal 1.5, and consequentlyno circuit could be established througbllt irnnsmitter and receiver of station X. If subscriber Y, however, desires to communicate with subscriber X,he will notify central, and central will then instruct him to operate his lever 22, so as to open his switch 21. This will while openprevent'the passage of direct currents, and all ofthemagnets 25 will consequently be decncrgized, and the detentarms .27 will be freed from their magnets 25 and held in place byjthe adjacent receiver-hook. Central will then call station X by any of the well-known systems of calling, and-when subscriber X takes down his receiver the (lete'ntarm 27 of his instrument will drop out of the path of movement of the terminal 15 thereof and permit an establishment of a talking-circuit through statlon X. When subscriber X talks through his transmitter, he will set up a pulsating current in the line through station Y, which will pass the condenser 23 of station Y, and consequently will energize the receiver of station Y, so that the calling subscriber Y will hear the-answer ofsubscriber X. Thereupon he.

will release'his lever so as to reestablish the circuit through his switch 21, and thus energize all ofthe magnets 25 of the'lineland keeping all of the detentarms 27', exc cpt those of his own-station and that o fthc called subscriber X up into the paths of movementof the adjacent terminals 15, and thusprevent' the cutting in of any other subscriber.

Consequently when the V a iases I claim as my irivention- 1. In a party-line telephone, the combination, with the talking-circuits thereof con- 'sisting in part of a pair of separable terminals,

and means normally controllable by the user for permitting engagement of said terminals, of electrically-controlled means for preventing contacting of said terminals, a switch in series with said terminals, and a condenser bridging said switch. v I 2. In a party-line telephone, the combination, with the talking-circuits thereof consisting in partof'apai'r'of separable terminals, and'means normally controllable by the user for permitting engagement of said terminals? of electrically-controlled means for preventing contacting of said terminals, a normally closed switch in series with said terminals, means for opening said normally closed switch, and a condenser bridging said switch.

3. In a'party-line telephone, the combination, with the talking-circuits thereof consistingin partof'a pair of separable terminals,

a movable receiver-hook normallyseparat- .ing said terminals, an electromagnet connected with one side of thetalking-circuit, a detent-annarranged within the influence of said magnet and having a portion adapted to "prevent contacting of the separable terminals of the talkingcircuit, a switch in series with said terminals, and a condenser-brldglng said. switch. I

4. Inaparty-line telephone, the combination, with the talking-circuits th'ereof con: sist ing in part of a pair of separable terminals, 7 a movable receiver-hook normally separating said terminals, an electromagnet connected with one side of the talking-circuit, a detent arm arranged Within the influence of said magnet and having a portion adapted to pre vent contactingof the separable terminals of the talking-circuit,a normally closedswitch in series with said terminals, means for opendenser bridging saidswitch]- ing said normallv closeds'witch,=and"'a con- 5. In a party-line tele hone, the combine tion, with the talking circuits thereof con sisting in part of a pair of separable terminals, of a movable receiver-hook normally separating said terminals, an electromagnet connected with one side of the talking-circuit, a detent-arm arrangedwithin the in fluence of said magnet and havinga portion adapted to preventcontactingofthe -sepa= rablc terminals of the-talking-circuit',"*a' switch in series with said terminals}. a con- (lenscnbridging said swit'ch, and m'eains for normally holding said iletent arni "t'oits magnct Y tff In a party-line telephone, the combina-' tion, with the talking-circuits thereof consisting in part of a pair of separable terminals, of a movable receiver-hook normally separating said terminals, an electr'omagnet connected with one side of the talking circuit, a dc A en 2-5 tent-arm arranged within the influence of said magnet and having a portion adapted to prevent contacting of the separable terminals of the talking-circuit, a normally closed switch in series with said. terminals, means .for opening said normally closed switch, a

condenser bridging said switch, and means for normally holding said detent-arm up to its magnet. I i

7. In a party-line ilephone, the combination with the talking-circuit thereof consisting in part of a pair of separable terminals, of a, movable receiver-hook normally sepa rating said terminals, an electromagnet connected with one side of the talking-circuit, a detent-arm arran 'ed within the influence of said magnet and 'aving a portion adapted to prevent contacting of-the separable terminals of the talking-circuit, ,a switch in series with said terminals, a condenser bridging said switch, and means carried by the reeeiver-hook to hold the detent up to the et..' a Y 8. In a party-line telephone, the combination with the talking-circuit thereof consistin part of a pair of separable terminals, of

a movable receiver hoo normally separating said terminals, an electromagnet connected with one side of the talking-circuit, a detent-arm arranged within the influence of said magnet and having a portion adapted to gator ope condenser ndgmg said switch, and means prevent contacting of theseparableterminals of the talking-circuit;-a normally closed switch in series with said terminals, means said normally closed switch, a

carried by the receiver-hook to hold the detent up to thema et.

9. In aparty-ine telepho1ie system, the combination with a' central grounded battery and the main-line wires connected thereto, of a plurality of telephones connect ed'to saigl main-line wires each of said,telepli'ones comprising-a talkingscircuit consist 5 ng'of a pair of separable terminals, means normally controllable by the user for permit- .ting contacting of said terminals, a grounded electromagnet connected to the grounded side of the main line, means influenced by said ma net for preventing contacting of the separab e terminals in the talking-circuit, a switch in series with said" terminals, and a condenser bridgin said switch. .7

10. In a party-line telephone system, the combination with' a central grounded battery and the main-line wires connectedthereto, of a plurality of telephopesconnected to said m ainfline wiresyeacn of said telephones comprising a talking-circuit consistmg of a pair of separable terminals, means normally controllable by the, user-for permit-' ting contacting of said terminals, a grounded ele'ctromagnet connected to. the grounded si e of the main line, means influenced by said magnet for preventing contacting of the separable terminals in the talking-circuit, a normally closed switch in series with said terminals; means for opening said normally closed switch, and a condenser bridging said switch.

-11.*In a party-line telephone system, the, combination with a central grounded battery and the main-line wires connected thereto, of a plurality of telephones connected to said main-line wires, each of said telephonescomprising a talking-circuit consisting of a. pan of separable term nals, a movable receiver-hoo normally separating said.termi-' nals, agrounded electromagnet connected to the grounded side of the main line, a detentmagnet and having a portion adapted to' prevent contactingof t arm arranged within the influence of said e separable terminals of the talkin -circuit, a switch in series with said terminals, and a condenser bridging sard sw tch.-

1,2. Ina party-line telephone system, the

combination with a centre grounded battery and the main-line wires connected thereto, of a plurality of telephones connected to said main-line wires, each of said telephones comprising a talking-circuit consisting of apair of combinationwith a centra grounded battery and the main-line wires connected thereto, of

main-line wires, each of said telephones comprising a talking-circuit consistingof a pair of 'separable terminals,a movable receiver-hook normally separating said terminals, a grorinded'elcctromagnet connected to the grounded side of the main line, a detent-armarranged within the influence of said magnet andhaving a portion adapted to prevent contacting of the separable terminals of the talking-circuit, a switch in series with-said terminals, a

separable terminals, a movable receiver hook aplurality of telephones con'nectedto said condenser bridging said "switch, and means controlled by the receiver-hook to lioldthe i detentnp to the magnet. I

:14. In a party-line telephone s stem, the combination with a central groun ed battery and the main-line wires connected thereto, of a plurality of telephones connected to said main-line wires, eachof said telephones comprising a talking-circuit consisting of a pair of (separable terminals, a movable receiver-hook normally separating said terminals, 8. groundedelectromagnet connected to the grounded side of the'main, line. a' detent-arm arranged .ment of said terminals when said 15. In a party-line telephone, the combina:

tion, with the talking-circuits thereof consisting in part of a pair of separable terminals,

a receiver-hook engaging one of said terminals and normally holning the same separated an eleetromagnet, a detent-arm within the influence of said magnet for preventing engagearm is inl'luenced by said magnet, and means controlled by the receiver-hook for holding the detent-arm against vibration. I j

,16; in a party-line telepl'ionc, the combination. with the talking-circuits thereof consisting in part of a pair oi separable terminals,

a recei Yer-hook engaging one of said terminals and normally holding the same separated, an

' electromagnet, a detent-arm within the in-.

tien, with the talking-circuits -thereof consisting in part of a pair of separable terminals, of electrically-controlled'means for preventingcontacting of said terminals, a receiverhook, and means-controlled by the receiverhook for normally holdingthe electricallyeontrolled means in position to prevent contaeting of said terminals Inwitnesswhereof I have hereunto set my hand an d seal, at Indianapolis, Indiana, this 15th'day of January, A. D. 1906.

MARK P. BOONE. [L. s3 W'itnesses:

IIORTENSE P. Booms, ARTHUR M. H001).

'1 7. In a party-line telephone, the eornbina- I 

